How do you say happen in Korean?
— 일어낟 (ireonada)

Specialized synonyms for happen in Korean
break부러지다 (bureojida)
come오다 (oda)
fall넘어지다 (neom-eo-ji-da); 쓰러지다 (sseu-reo-ji-da); 떨어지다 (ddeol-eo-ji-da); 하락하다 (harak-hada)
give주다 (juda); 드리다 (deurida)
go가다 (gada)